If Iran is guilty of a crime, and there is evidence to support that claim, the United States and the world should seek its prosecution. Instead, the United States is isolating itself by tearing down the rule of law. It is destroying its credibility by threatening to abandon an agreement. In a Gallup poll in 2013 and a Pew poll in 2017 the majority of nations polled had the United States receive the most votes as the greatest threat to peace on earth. In the Gallup poll, people within the U.S. chose Iran as the top threat to peace on earth -- Iran which had not attacked another nation in centuries and spent less than 1% of what the U.S. spent on militarism. These views are clearly a function of what people are told through news media.
The history of U.S./Iranian relations matters here. The U.S. overthrew Iran's democracy in 1953 and installed a brutal dictator / weapons customer.
The U.S. gave Iran nuclear energy technology in the 1970s.
In 2000, the CIA gave Iran nuclear bomb plans in an effort to frame it. This was reported by James Risen, and Jeffrey Sterling now sits in prison for allegedly being Risen's source.
The Trump White House has openly expressed a desire to claim that Iran has violated the 2015 nuclear agreement, but has produced no evidence.
The push to attack Iran has been on for so long that entire categories of arguments for it (such as that the Iranians are fueling the Iraqi resistance) have come and gone.
What's changed that gives the question more importance than ever is that the United States now has a president who seeks the approval of people who want to bring about the end of the world in the Middle East for religious reasons, and who have praised President Trump's announcement of moving the U.S. embassy in Israel to Jerusalem for just those reasons.
The United States aided Iraq in the 1980s in attacking Iran, providing Iraq with some of the weapons (including chemical weapons) that were used on Iranians and that would be used in 2002-2003 (when they no longer existed) as an excuse for attacking Iraq.
For many years, the United States has labeled Iran an evil nation, attacked and destroyed the other non-nuclear nation on the list of evil nations, designated part of Iran's military a terrorist organization, falsely accused Iran of crimes including the attacks of 9-11, murdered Iranian scientists, funded opposition groups in Iran (including some the U.S. also designates as terrorist), flown drones over Iran, openly and illegally threatened to attack Iran, and built up military forces all around Iran's borders, while imposing cruel sanctions on the country.
The roots of a Washington push for a new war on Iran can be found in the 1992 Defense Planning Guidance, the 1996 paper called A Clean Break: A New Strategy for Securing the Realm, the 2000 Rebuilding America's Defenses, and in a 2001 Pentagon memo described by Wesley Clark as listing these nations for attack: Iraq, Libya, Somalia, Sudan, Lebanon, Syria, and Iran.
It's worth noting that Bush Jr. overthrew Iraq, and Obama Libya, while the others remain works in progress.
In 2010, Tony Blair included Iran on a similar list of countries that he said Dick Cheney had aimed to overthrow. The line among the powerful in Washington in 2003 was that Iraq would be a cakewalk but that real men go to Tehran. The arguments in these old forgotten memos were not what the war makers tell the public, but much closer to what they tell each other. The concerns here are those of dominating regions rich in resources, intimidating others, and establishing bases from which to maintain control of puppet governments.
Of course the reason why "real men go to Tehran" is that Iran is not the impoverished disarmed nation that one might find in, say, Afghanistan or Iraq, or even the disarmed nation found in Libya in 2011. Iran is much bigger and much better armed. Whether the United States launches a major assault on Iran or Israel does, Iran will retaliate against U.S. troops and probably Israel and possibly the United States itself as well. And the United States will without any doube re-retaliate for that. Iran cannot be unaware that the U.S. government's pressure on the Israeli government not to attack Iran consists of reassuring the Israelis that the United States will attack when needed, and does not include even threatening to stop funding Israel's military or to stop vetoing measures of accountability for Israeli crimes at the United Nations. (President Obama's ambassador refrained from one veto on illegal settlements, while President-Elect Trump lobbied foreign governments to block the resolution.)
In other words, any U.S. pretense of having seriously wanted to prevent an Israeli attack is not credible. Of course, many in the U.S. government and military oppose attacking Iran, although key figures like Admiral William Fallon have been moved out of the way. Much of the Israeli military is opposed as well, not to mention the Israeli and U.S. people. But war is not clean or precise. If the people we allow to run our nations attack another, we are all put at risk.
Most at risk, of course, are the people of Iran, people as peaceful as any other, or perhaps more so. As in any country, no matter what its government, the people of Iran are fundamentally good, decent, peaceful, just, and fundamentally like you and me. I've met people from Iran. You may have met people from Iran. They look like this. They're not a different species. They're not evil. A "surgical strike" against a "facility" in their country would cause a great many of them to die very painful and horrible deaths. Even if you imagine that Iran would not retaliate for such attacks, this is what the attacks would in themselves consist of: mass murder.
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